Redundancy (was: Need command to inhibit freshness checks)

[Andreas Ericsson]

While we're on the topic of redundancy and such, I've got a couple of 
questions to shoot off in shotgun mode. I'm especially interested in 
hearing from nagios-db developers.

Situation; We're about to roll out a 20K+ nodes network monitoring 
system (nagios world record?). While most of the nodes will be monitored 
with standalone redundant system (30 desktop stations with a webbrowser 
each and a 100 foot long multi-monitor wall), loadbalancing and 
redundancy will still be an issue for the 4 global NOC's.

What's the general view of moving such code in-core, and have the nagios 
daemon handle portioning of checks, synchronizing internal 
status-tables, sending regular heartbeats and such?

If not in-core;
Could this be done with a nagios-module?
How much access do they have at loadtime/run-time?
Can they register to handle config file options?
Command line options?
Can they make things NOT happen (like logging to files)?
Just how stable is the module-handling code?
What impact could a misbehaving module have on the daemon as a whole?

Ethan Galstad wrote:
> Actually, they're already there... :-)
> 
> ENABLE_SERVICE_FRESHNESS_CHECKS
> DISABLE_SERVICE_FRESHNESS_CHECKS
> ENABLE_HOST_FRESHNESS_CHECKS
> DISABLE_HOST_FRESHNESS_CHECKS
> 
> These commands apply globally, so they should be what you're looking 
> for.
> 
> 
> On 20 Jan 2005 at 8:28, Jason Martin wrote:
> 
> 
>>I've got a failover monitoring setup. One problem I'm having is
>>that some of my checks are freshness-based, and the standby
>>Nagios server is executing them even though all service checks
>>are disabled.  May I suggest the addition of an external command
>>that allows globally inhibiting / enabling freshness checks?
>>
>>Thanks,
>>-Jason Martin
>>-- 
>>Words are not food, though sometimes we must eat them.
>>This message is PGP/MIME signed.
>>
> 
> 
> 
> 
> Ethan Galstad,
> Nagios Developer
> ---
> Email: nagios at nagios.org
> Website: http://www.nagios.org
> 
> 
> 
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-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Lead Developer


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